The paper reported Cabinet ministers have also warned Mrs May she would have to stand down if the deal is defeated and she fails to secure better terms from the European Union.

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It came as Labour leader Jeremy Corbyn said he would consider delaying Britain’s exit from the EU to negotiate a better deal if his party came to power.

He told Sky News: ‘If we go into government straight away we would start negotiating straight away. If it meant holding things a bit longer to do it, of course.’

Mr Corbyn said his party was ready to ‘step in and negotiate’ with the EU, and would form a minority government ‘if that is what is on offer’.

May is hoping to convince MPs her agreement is the best deal on Tuesday (Picture: AFP)

Former Tory leader Lord Howard said May would have ‘difficult decisions to make about her future and about the future of our country’ if she loses the crunch Brexit vote on 11 December.

Lord Howard said discussions with the European Union should be intensified to prepare for Brexit without a full Withdrawal Agreement.

He told BBC Radio 4’s Today: ‘We should seek to put in place some ad hoc, temporary arrangements with the agreement of the European Union which would minimise and, indeed, perhaps even eliminate any disruption at the border on March 30 next year.

‘We should also undertake that we would unilaterally, for the period of 12 months after March 29, allow any goods and services in from the European Union without any tariffs or tariff barriers or obstacles in any way – hope that they will reciprocate but do it even if they don’t – and use that 12-month period to negotiate a free-trade agreement along the style of Canada-plus.’